Extensible-plunger pump



E. W. PATTERSON EXTENS IBLE PLUNGERl BUMP Filed Aug. 1o, 1927 2 sheets-'sheet 1 7 W Mw fw 4 Z o d H 4 M 4 ,zw

//f /f t m Eofm, W. Pfr Temo/v,

HTTo/Ex @Ct 289 1930. yE. w. PATTERSON EXTENSIBLE PLUNGER PUMP,-

2 Sheets-Sheet 2 Filed Aug. l0, 192'? TOQQ: EDGH, W. PHTTEQJON, Br Y HTTOQQMEK i lp lll 241| Patented occ. 2s, 1930 PATENT OFFICE EDGAR W. PATTERSON, 0F LOS ANGELES, CALIFORNIA."

EXTENSIBLE-PLUNGER PUMP Application filed August 10, 1927. Serial No. 211,933.

My invention relates to pumps, and it is an object ofmy invention to provide al novel pump for use in deep wells.

In pumping deep wells, and particularly 5 oil wells, a reciprocating pump is usually placed in the well at the lower end of a string of pump tubing which extends to the top of the well. rIhe pump has a barrel connected to the tubing and a plunger which is suspended from the lower end of a string of sucker rods extending through the tubing and operated from the top of the well so as to reciprocate the plunger in the barrel. These pumps are necessarily of small diame ter and in order to get volume the stroke must be relatively long; It is therefore of vital importance that the internal or wearing surface of the barrel be ground to a high degree of accuracy, so that the plunger will make a fluid-tight kfit therein without jamming. The accurate grinding of these long internal surfaces of small diameter is very expensive but previously nopump has been produced which does not require this.

It is an object of my invention to provide a deep well pump in which the ground sur-v faces required are relatively short, thus greatly decreasing'the initial cost of the pump.

The rate of wear between the plunger and barrel of a reciprocating deep well pump measures the life of the pump. In the ordinary 4pump of this class where a single lunger slides against a single wearlng surface of the barrel 'for the complete length of the stroke, lthe abrasive eect of sand admitted between the plunger and the barrel. is so great raised to the surface of the ground for repairs.

It is a further object of my invention to provide a deep wellpump in which a plurality of plungers operate in an yequal number of barrels, the length of the stroke of the pump being divided between these plungers so thatthe abrasive action tending to wear away the sliding surface of each barrel and its plunger is correspondingly decreased.

Further objects and advantageswill be made manifest in the following description and in the accompanying drawings in which that the pump must be frequently a preferred embodiment of my invention is illustrated. In the drawings Fig. 1 is a vertical sectional view illustrating the upper portion of a deep well pump embodying the features of my invention.

Fig. 2 is a vertical sectional View illustrating the lower portion of the same pump.

Fig. 3 is a horizontal sectional view taken on the line 3-3 of Fig. 1.

Fig. 4 is a diagrammatic vertical sectional View illustrating the complete pump shown in Figs. 1 and 2.

Fig. 5 is a vertical sectional view diagrammatically illustrating a modified form of pump embodying the features of my invention.

Referring to the drawings, one embodiment of my invention comprises a deep well pump 10 which includes a tubular shell 11 connected by an upper collar 12 to the lower end of a string of pump tubing 13 and by a lower collar 14 to a well-oil inlet pipe 15. The oil pump 10 is adapted to be disposed in the bottom of a deep well, the pump tubing 13 extending upwardly to the top of the well. The upper collar 12 has a tapering seat 16, the lower end of which has substantially the same diameter as the shell 11 and the upper end ofvwhich has substantially the same diameter as the pump tubing 13.

The lower collar 14 has a tapered seat 17 with which the body 18 of a standing valve 19 is adapted to make a sealing fit so as to close the lower end of a chamber 20, provided within the vshell 11, against downward movement of fluid therefrom.

Extending downward from the top of the I well through the pump tubing 13 is a string of sucker rodsl (not shown) the lower end of which is threadedly connected to 'a threaded pin 25 of a rod connection 26. The rod connection 26 has a central cavity 27 which .is threaded at its lower end, from the upper end of which radial holes 28 communicate with the interior of the tubing 13.

Threadedly received in the lower end of the cavity 27`and locked in place by a locknut 30 is the upper end of a hanging tube 31. The hanging tube 31 extends downward through the collar 12 into the pump chamber 20. The lower end of the hanging tube 31 is threaded externally and an internally and externally threaded nipple 32 of a working valve 33 is screwed upon the lower end of the hanging tube 31. Having its lower end internally threaded so as to tightly screw over the nipple 32 is a tubular cylinder 36. Threadedly received into the upper end of the cylinder 36 so as to provide an annular shoulder 37 projecting inward from this cylinder is a nut 38. Disposed about the hanging tube 31 so as to project downward between the nut 38 and thehanging tube 31 is a piston tube 40 of an intermediate tubular membe-r41. Screwed upon the lower end of the tube 40 is an annular piston 42 which is provided with annular packing rings 43 to makea fluid-tight fit with the inner surface of thecylinder 36. The tube 40 and the piston 42 make a loose sliding fit with the hanging' tube 3l.

llfhe intermediate .member 41 includes a tubular cylinder 44 which is integrally oonnected with the upper end of the tube 40 and is of substantially the same diameter and length as the cylinder 36. The upper end of the cylinder-44 is internally threaded .and a. nut 46 is screwed therein to provide an annular shoulder 47 extending inward from the cylinder 44.

Disposed about the hanging tube 31 and making a loose fit therewith isv aplug member 50havi`ng a tapering outer surface 51 on the -upperiportion thereof which is adaptedto'v tit the tapering seat 16 of the'collar 12. Provided about the lower portion of theplug 50 :are a series of packing rings 52 which engage thevinner surface of the upper end of the tubular shell 11" so as to make a fluidtight fit therewith. Extending downward from the lower end of the plug 50 is a tube neck 55, the lower portion of which is disposed between the nut 46 and the hangingv tube 31. The lower end of the neck 55 is externally threaded and a piston 57 is screwed thereon, the piston 57 having annular packing rings 58 which make a fluid-tight it with the inner surface of the tubular cylinder 44. The plug 50, the neck 55, and the piston 57 make a loose sliding it upon the hanging tube 31. f

In Fig. 4 the pump 10 is illustrated to' show the cylinder 44 of the intermediate member 41 receivingV a plunger 6() of a second intermediate member 61 identical with the member 41, instead of receiving the pis- Cooperatin which has a xed relation upon the plug 50 and 'the lower cylinder 36 which is carried by the lower end of the hanging tube 31, these intermediate tubular members form a elescopic envelope 65 which operates as fol- OWS.

After the pump tubing 13 has been installed in the well with the collars 12 and 14 and the shell 11 assembled on the lower end thereof, the standing valve 19 is then lowered into place. The remaining parts of the pump 10, assembled as they are upon the hanging tube 31, are now lowered into the tube 13 suspended upon the lower end of the string of sucker rods previously mentioned. While being lowered, the tubular members telescopically mounted upon the hanging tube` 31 are in telescoped or collapsed position. "When the plug 50 fits upon the seat 16 so that the packing rings 52 make a fluidtight fit with the upper end of the shell 11,

the sinking of the hanging tube 31 farther into the chamber 20 causes an extension of the envelope 65. F ig. 4 shows this envelope almost completely extended.

rEhe pump 10 is now operated by reciprocation of the hanging tube 31 by the string of sucker rods to whichit is connected. As the hanging tube 31 moves upward, the working valve 33 closes, causing the standing valve 19 to openand admit well fluid into the chamber 20.. When thel hangingv tubeA 31. has ,practiq cally collapsed the-.envelope 65l on. its. upV

stroke and has started its' down'stroke, the

standing valve 19 is closed and the workingV valve 33 opens to cause the fluid admitted to the chamber 20 to passupward through the working valve 33.

The envelope 6 5 maintains a fluid-tight connection between the plug 50 andthe working valve33 throughout thelength ofthe stroke of the hanging tube 31 without any two wearing parts sliding together over a corresponding distance. In fact, the working stroke of the pump is divided between the pistons 42, 57 and 6() so that each moves in its corresponding cylinder only one-third the distance of the entire stroke of the pump. This results in a much lower abrasive effect upon the cylinders so that the life of the wearing surfaces of these cylinders is much longer than the life of the cylinder of a single plunger pump having the same stroke as the pump 10.

There is a great demand for pumps having longer strokes than those now in use but experimental pumps designed to till this demand have shown that the abrasive effect of the piston upon the cylinder is so'great that a slngle plunger pump with a barrel of considerable length is impractical. By the use of my invention pumps of any desired stroke may be made without increasing the abrasive eifect between the sliding parts with the upper piston 57 Y means for fixing one terminal mem thereof. Likewise it is to be noted that there are very few ground surfaces required on the parts of the pump 10 and that where these are required they are very short in len h. Thus the longest ground surface require in the pump 10 is the internal surface of each of the cylinders making up the envelope which, as above noted, need be only a third as long as the barrel of a single plunger pump having the same length of stroke as the pump 10.

Fig. 5 shows a modied form of pum 70 embodying m invention. In the pumpli() a pump tubing 1 has a seat 72 Jformed therein upon which a standing valve 7 3 is adapted to rest. Extending upward from the standing valve 7 3 is a tubular piston member 7 4 which remains stationary during the operation of the pump. Formed upon theupper end of the piston member 74 is a piston 75 which works in the c linder 7 6 of an intermediate member 77. rovided on the upper end of the intermediate umember 77 isv a plunger 78 which is adapted to work in a cylinder 79. The cylinder 79 has a working valve 80 provided to control an opening therefrom into the interior of the tubing' 71. The cage ofthe working valve 80 is connected to a string of sucker rods 81 by which a telescopic envelope 82, formed by the cylinder 79, the plunger ber 77 may be extended by drawing upward on the cylinder 79. As the envelope 82 is extended, ithe standing valve 73 is opened to admit oil into a chamber 83 formed within the envelope 82. As the cylinder 79 is allowed to drop so as to collapse the envelope 82, the standing valve 73 closes and the oil trapped in the chamber 83-opens the working valve 80 and passes out into the interior of the pump tubing 71.

I claim as my invention:

1. In a dee well pump the combination of:

. a plurality o adjacent pairs of tubular members telescopically connected together in series to form a continuous chamber therein; means for fixing one end of said series means for moving the other end of said series to telescopically lengthen or shorten said serles; and valve means confining the flow of fluid through said chamber to a ilow in a single direction.

2. In a deep well ump, the combination of: a plurality of ongitudinally adjacent pairs of telescopically conengaging tubular members connected together in series to form an expansible and contractile pum ing unit;

r of said series; means for moving the op osite terminal member of said series to lengt en or shorten said unit; and means for insuring a unidirectional flow of pumped fluid through said unit.

j 3. vIn a deep well ump the combination of: a plurality of adjacent pairs of tubular 7 4 and the intermediate memv members telepscopically connected together in series to form a continuous chamber, one end of said series being fixed; means for fixing one end of said series; a standing valve for admitting liquid into said chamber; means for moving the other end of said series to lengthen or shorten said series; a working valve connected with said chamber through one of the tubular members of said series; and means for reciprocating the last mentioned tubular member.

4. In a dee well pump the combination of: a plurality oi) pairs of tubular members telescopically connected together in series to form a continuous chamber therein, one end of said series being fixed means for moving the other end of said series to lengthen or shorten said series; and valve means confining the iow of liquid through said chamber to a iow in a single direction.

5. In a deep well pump the combination of a plurality of pairs of tubular members telescopically connected together in series to form a continuous chamber therein; means for fixing one end of said series; means for moving the other end of said series to lengthen or shorten said chamber; and a valve confining the iow of liquid through said chamber to a flow in a single'direction.

6. In a deep well pump' the 'combination of: a plurality of' adjacent pairs of tubular members telescopically connected together in series to form a continuous chamber therein; a tubular member to which one end of said series is fixed; means for moving the other end of said series to lengthen or shorten said series; and means for confining the flow of liquid through said chamber toa iow in a single direction.

7. In a dee well pump the combination of: a series of tubular members serially and telescopically connected together to form a continuous chamber therein; means for fixing one end of said series; means for lengthening or shortening said series; and av valve in the fixed end of said series adapted to confine the ow of li uid through said chamber to a iow in a sing e direction.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 5th day of August, 1927.

EDGAR W. PATTERSON. 

